CVE-2026-86596

s2Member <= 260927 - Unauthenticated Remote Code Execution via 'item_name' IPN Parameter

Published Nov 2, 2026 CVSS 3.1 · 9.8 Critical EPSS 1.5% KEV · Not listed
Description
The s2Member plugin for WordPress is vulnerable to Remote Code Execution in all versions up to, and including, <= 260927 via the 'item_name' parameter parameter. This is due to insufficient sanitization in strip_php_tags_deep(), which only strips literal '<?' sequences, combined with a post-interpolation placeholder cleanup that reassembles a valid '<?php' opener after the attacker-controlled value has already been embedded in the email template. This makes it possible for authenticated attackers, with custom-level access and above, to execute code on the server.

Remediation

No solution or workaround provided in the CVE record

Tracking

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Advisories

No advisories available
History
Type Values Removed Values Added
First Time appeared Clavaque
Clavaque s2member
Wordpress-extensions
Wordpress-extensions s2member
Vendors & Products Clavaque
Clavaque s2member
Wordpress-extensions
Wordpress-extensions s2member
Type Values Removed Values Added
Metrics ssvc

{'options': {'Automatable': 'yes', 'Exploitation': 'none', 'Technical Impact': 'total'}, 'version': '2.0.3'}

Type Values Removed Values Added
Description The s2Member plugin for WordPress is vulnerable to Remote Code Execution in all versions up to, and including, <= 260927 via the 'item_name' parameter parameter. This is due to insufficient sanitization in strip_php_tags_deep(), which only strips literal '<?' sequences, combined with a post-interpolation placeholder cleanup that reassembles a valid '<?php' opener after the attacker-controlled value has already been embedded in the email template. This makes it possible for authenticated attackers, with custom-level access and above, to execute code on the server.
Title s2Member <= 260927 - Unauthenticated Remote Code Execution via 'item_name' IPN Parameter
Weaknesses CWE-94
References
Metrics cvssV3_1

{'score': 9.8, 'vector': 'CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H'}

Weaknesses

Sources

Status
PUBLISHED
Assigner
Wordfence
Published
Updated
Nov 8, 2026, 7:05 PM
Reserved
Sep 8, 2026, 8:18 AM
Status
Deferred
Published
Nov 2, 2026, 10:17 PM
Modified
Nov 8, 2026, 7:17 PM